"Forget things like uranium mines or nuclear reactors," said cosmochemist Robert Reedy, a member of the Kaguya science team and a senior scientist at the Tucson-based Planetary Science Institute. "The concentrations are very far from being of commercial levels."

The new map was created using data from Japan's Kaguya spacecraft, which launched in 2007. The spacecraft found uranium on the moon, along with other radioactive elements, with its advanced gamma-ray spectrometer.

Kaguya crashed into the moon's surface at the end of its mission last year.

The new moon uranium map clearly shows the element is not abundant on the moon. In moon rock, it appears in quantities less than in many Earth granites.

Moon's early history

Still, by analyzing the ratio between the naturally radioactive elements uranium and thorium scientists may yield new insights into the formation and evolution of the moon's surface. In the new map, significant variations in the ratio between uranium and thorium were revealed.

For instance, average uranium abundances could differ by some 60 percent between the east and west highlands on the far side of the moon, while thorium abundances between those areas varied only 10 percent.

These new findings suggest the formation of the lunar crust might not be as uniform as had long been thought.

"The Kaguya gamma-ray spectrometer team wants to finish getting maps for as many elements as possible before drawing detailed conclusions on the Moon's history," Reedy said.